Filtering array structs by attributes

filter_array_of_structs.rb

module Where
  def where(options)
    cols = options.keys
    vals = options.values

    select { |item| item.to_h.values_at(*cols) == vals }
  end
end
Array.send :include, Where


foo = Struct.new :name, :age
ary = 10.times.map { foo.new("foo_#{rand 2}", rand(3)) }

p ary
# =>  [#<struct name="foo_1", age=0>, #<struct name="foo_1", age=1>,
# #<struct name="foo_0", age=2>, #<struct name="foo_1", age=2>,
# #<struct name="foo_0", age=2>, #<struct name="foo_1", age=1>,
# #<struct name="foo_0", age=2>, #<struct name="foo_0", age=2>,
# #<struct name="foo_1", age=1>, #<struct name="foo_0", age=1>]

p ary.where(name: "bar")
# => []

p ary.where(name: "foo_1")
# => [#<struct name="foo_1", age=0>, #<struct name="foo_1", age=1>, #<struct name="foo_1", age=2>, #<struct name="foo_1", age=1>, #<struct name="foo_1", age=1>]

p ary.where(name: "foo_1", age: 1)
# => [#<struct name="foo_1", age=1>, #<struct name="foo_1", age=1>, #<struct name="foo_1", age=1>]